ATmega32HVB datasheet(108/273 Pages) ATMEL

108 / 273 page

108

8042A–AVR–07/09

ATmega16HVB/32HVB

19. Coulomb Counter - Dedicated Fuel Gauging Sigma-delta ADC

19.1

Features

• Sampled System Coulomb Counter

• Low Power Sigma-Delta ADC Optimized for Coulomb Counting

• Instantaneous Current Output with 3.9 ms Conversion Time

– 13 bit Resolution (including sign bit)

– Interrupt on Instantaneous Current Conversion Complete

• Accumulate Current Output

– Programmable Conversion Time: 128/256/512/1024 ms

– 18-bit Resolution (including sign bit)

– Interrupt on Accumulation Current Conversion Complete

• Regular Current Detection Mode

– Programmable Sampling Interval: 256/512/1024/2048 ms

• Programmable Input Voltage Range ± 100/200mV

– Allowing Measurement of ± 20/40A @ 5 m

• Offset canceling by input polarity switching

19.2

Overview

ATmega16/32HVB features a dedicated Sigma-Delta ADC (CC-ADC) optimized for Coulomb

Counting. By sampling the charge or discharge current flowing through an external sense resis-

tor RSENSE, the CC-ADC is used to track the flow of current going into and out of the battery

cells.

Figure 19-1. Coulomb Counter Block Diagram

The CC-ADC has a programmable voltage range allowing trade-off to be made between resolu-

tion, dynamic range and external sense resistor RSENSE.

Sigma Delta

modulator

Current

Comparator

Control &

Status

Registers

IRQ

8-BIT DATABUS

Regular

Current Level

Decimation

Filter

Decimation

Filter

IRQ

RSENSE

Polarity

Switcher

Instantaneous

Current

Accumulate

Current

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